Posted a reply in this thread a few days backviewtopic.php?f=3&t=3885
Was able to post attachments and inline images, but if I hit PREVIEW, all but one of the files would be removed from the post. I had to compose the image and just hit SUBMIT for the attachments to stick.

Even now if I go into my message with the EDIT button, only one attachment is shown. I tried both Firefox and Chrome with the same results, and have also used different computers.

Thank you guys for bringing this to our attention - this is apparently a known bug in this version of phpBB. There's a patch that we've applied and tested, and I believe this is now resolved - please test it yourselves if possible and let me know if there are further issues.